nsvis_stab18.F

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!||====================================================================
!||    nsvis_stab18   ../engine/source/elements/solid/solide8e/nsvis_stab18.F
!||--- called by ------------------------------------------------------
!||    m1lawtot       ../engine/source/materials/mat/mat001/m1lawtot.F
!||====================================================================
      SUBROUTINE nsvis_stab18(SIG  ,C1  ,G2    ,VOL  ,D1   ,
     .                      D2   ,D3  ,D4    ,D5   ,D6   ,
     .                      RHOREF,G  , NPG  ,NEL   ) 
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
C     REAL
      INTEGER, INTENT(IN) ::NEL,NPG
      my_real, DIMENSION(MVSIZ),INTENT(IN) :: VOL,
     .                   d1, d2, d3,d4, d5, d6,rhoref
      my_real, INTENT(IN) :: c1,g2
      my_real, DIMENSION(NEL,6), INTENT(INOUT) :: sig
      my_real, DIMENSION(MVSIZ), INTENT(INOUT) :: g
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, MT
C     REAL
      my_real
     .   dd, al, cns1, cns2, cns3,ssp1,mu1,mu,
     .   dav, pvis, nrho,jac,fac,tol,ff,rhossp,facg,facmax
#ifdef MYREAL8 
      my_real, PARAMETER :: real_three = 3.0d0
      my_real, PARAMETER :: real_one = 1.0d0
#else
      my_real, PARAMETER :: real_three = 3.0
      my_real, PARAMETER :: real_one = 1.0
#endif
C-----------------------------------------------
        ssp1 = two_third*g2+c1
        mu = zep02
        mu1 = 0.015
        DO i=1,nel
          ff = -min(sig(i,1),sig(i,2),sig(i,3))
          IF (two*ff <=g2 ) cycle
          facg = max(one,sqrt(ff/g2))
          IF (facg>one  ) mu1 = facg*mu
          al = (npg*vol(i))**(real_one/real_three)
          rhossp = sqrt(ssp1*rhoref(i))
          cns2=mu1*al*rhossp
          cns3=half*cns2
          sig(i,4)=sig(i,4) + cns3 * d4(i)
          sig(i,5)=sig(i,5) + cns3 * d5(i)
          sig(i,6)=sig(i,6) + cns3 * d6(i)
          dd =-d1(i)-d2(i)-d3(i)
          dav=dd * third
          sig(i,1)=sig(i,1) + cns2 *(d1(i)+dav) 
          sig(i,2)=sig(i,2) + cns2 *(d2(i)+dav) 
          sig(i,3)=sig(i,3) + cns2 *(d3(i)+dav) 
          fac = one+two*mu1 
          g(i) =fac*g(i)   ! time step concern
        ENDDO
C      
      RETURN
      END